New York attorney record · Judicial Dept 3
Timothy Sean O'Brien
John Marshall Law School alumna, admitted to the New York bar in 2006, registered office in Oak Park, IL. This established record's status, address, and registration history come straight from the NY Office of Court Administration.
- 2006
- Admitted
- 20
- Years in bar
- 4434601
- NY reg #
The record in one line
Timothy Sean O'Brien has held an active New York bar license for 20 years - admitted in 2006, longer-tenured than 51% of the state's currently-active attorneys.
- 20 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- Top 49%
- by tenure among active NY attorneys
- Law school
- John Marshall Law School
Data updated May 2026
What this profile tells you
Bar status & tenure
Timothy Sean O'Brien carries New York bar registration 4434601, an established, active practitioner in good standing. Registration is recorded within Judicial Department 3, the appellate division overseeing this attorney's home district.
Practice context & education
Practice address is listed under O Brien Estate Law, LLC, located in Oak Park, IL, ZIP 60301. Educational background: JOHN MARSHALL LAW SCHOOL (103 registered alumni).
State context & due diligence
With an established practice on record, Timothy Sean O'Brien remains inside the New York bar's active cohort - see below for how that share of the register compares.
Experience vs. the active New York bar
Timothy Sean O'Brien was admitted in 2006, giving 20 years on the New York register. The histogram places that tenure against every currently-active attorney in the state, taller bars hold more attorneys at that experience level.
20 years on the New York bar
Years since admission, all currently-active NY attorneys
20 Top 49% higher than 51% of 284,296 active NY attorneys
Each bar is a band; taller bars hold more active NY attorneys. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NY Office of Court Administration, Attorney Registration · May 2026
How Timothy compares to fellow John Marshall Law School alumni
Among the 83 John Marshall Law School graduates in the New York register, Timothy Sean O'Brien is longer-tenured than 34% - a school-cohort view of experience, alongside the statewide one above.
20 years vs. John Marshall Law School alumni
Years since admission - 83 NY-registered alumni of this school
20 Top 66% higher than 34% of 83 fellow alumni
Each bar is a band; taller bars hold more fellow alumni. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NY Office of Court Administration, Attorney Registration · May 2026
John Marshall Law School's active-bar rate
Of John Marshall Law School's 103 alumni in the New York register, 56.3% currently hold "Currently registered" status, below the statewide average.
John Marshall Law School alumni, active-bar rate
The 2006 admission class today
Of the 8,638 attorneys admitted to the New York bar in 2006, 67.6% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 4434601
- Year Admitted
- 2006 (20 yrs · senior)
- Judicial Department
- 3
- Next Registration
- Aug 2026
Location & Contact
- Company
- O Brien Estate Law, LLC
- City
- Oak Park, IL
- ZIP Code
- 60301
- Phone
- (312) 813-9202
Education
Status Distribution Across the New York Bar
Timothy Sean O'Brien's current status, "Currently registered", places this attorney in the 66.2% of the 429,620-attorney New York register currently marked active.
Full statewide breakdown & source note
Source: NY Office of Court Administration, Attorney Registrations. Status counts reflect the latest reporting cycle. Bar status confirms registration only; it does not imply competence, specialty fit, or freedom from complaints.
Verify This Attorney
Verify on NY Courts Attorney SearchNearby Attorneys in Oak Park, IL
Compare credentials side-by-side
Compare Timothy Sean O'Brien with similar attorneys in Oak Park.
Compare attorneys →Before you rely on this record
Timothy Sean O'Brien's "Currently registered" listing confirms bar standing only, it is a registration fact to verify, not a verdict on quality or competence.
Frequently Asked Questions
Where is Timothy O'Brien licensed?
Timothy O'Brien is licensed to practice law in New York.
When was Timothy Sean O'Brien admitted to the bar?
Timothy Sean O'Brien was admitted to the bar in 2006.
Where did Timothy Sean O'Brien go to law school?
Timothy Sean O'Brien attended JOHN MARSHALL LAW SCHOOL.
What company does Timothy Sean O'Brien work for?
Timothy Sean O'Brien is associated with O Brien Estate Law, LLC in Oak Park, IL.
Is Timothy Sean O'Brien in good standing?
Yes, Timothy Sean O'Brien holds active bar status ("Currently registered").
Sourced from the NY Office of Court Administration, informational only, not legal advice. Full disclosure.
Read our methodology - how this data is sourced, computed, and verified.